Maestro Error

Me and some friends were playing a match of team builder. I get to the loading screen but ended up with a black screen. A pic i snapped shown in attachments gave me this bug. i tried disconnecting myself from the internet, re login to the launcher, and reconnecting into the game. No matter what i do, i am forced to stay out of the match. The reconnected goes invisible after i attempt to join. I just want this bug issue to be known.